my name's dan, i'm the ceo of the city club, and i'm very delighted to be here today with professor michael similar. michael is the acting dean of the law school, he's the baker hostettler professor of law, a leader in the practice and study of international criminal law and the host of the public radio program talking foreign policy, all of which is wonderful, but we're actually here to talk about something else, his new book. it is called "customary international law in times of fundamental change: recognizing grotian moments." >> wow. >> wow. which sounds like a mouthful of academic jargon, but what it's really about is how certain moments in history create the kinds of conditions for new laws to emerge as a force for good on a planetary scale which is certainly relevant today. michael, great to see you. >> and, dan, do you want to mention who you are? >> i did, i did. okay. i'm going to assume that i'm not the only lawyer in the audience, here in the room or watching on c-span. so can we start with a couple of terms, customary international law and grotian moment. which one do you want